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authorBjorn Helgaas <bjorn.helgaas@hp.com>2008-06-27 16:56:58 -0600
committerAndi Kleen <andi@basil.nowhere.org>2008-07-16 23:27:06 +0200
commit5acf91415799025410cc0d13101340d352f34c89 (patch)
tree27b50f8db97be4d5c06dbb989fa49be928aeb38d /drivers/pnp/pnpacpi/rsparser.c
parentaee3ad815dd291a7193ab01da0f1a30c84d00061 (diff)
downloadlinux-linaro-stable-5acf91415799025410cc0d13101340d352f34c89.tar.gz
PNPACPI: keep disabled resources when parsing current config
When we parse a device's _CRS data (the current resource settings), we should keep track of everything we find, even if it's currently disabled or invalid. This is what we already do for ISAPNP and PNPBIOS, and it helps keep things matched up when we subsequently re-encode resources. For example, consider a device with (mem, irq0, irq1, io), where irq0 is disabled. If we drop irq0 when parsing the _CRS, we will mistakenly put irq1 in the irq0 slot when we encode resources for an _SRS call. Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com> Signed-off-by: Len Brown <len.brown@intel.com> Signed-off-by: Andi Kleen <ak@linux.intel.com>
Diffstat (limited to 'drivers/pnp/pnpacpi/rsparser.c')
-rw-r--r--drivers/pnp/pnpacpi/rsparser.c70
1 files changed, 52 insertions, 18 deletions
diff --git a/drivers/pnp/pnpacpi/rsparser.c b/drivers/pnp/pnpacpi/rsparser.c
index 9a45c25b46d2..595252b65205 100644
--- a/drivers/pnp/pnpacpi/rsparser.c
+++ b/drivers/pnp/pnpacpi/rsparser.c
@@ -98,8 +98,10 @@ static void pnpacpi_parse_allocated_irqresource(struct pnp_dev *dev,
int irq, flags;
int p, t;
- if (!valid_IRQ(gsi))
+ if (!valid_IRQ(gsi)) {
+ pnp_add_irq_resource(dev, gsi, IORESOURCE_DISABLED);
return;
+ }
/*
* in IO-APIC mode, use overrided attribute. Two reasons:
@@ -248,24 +250,39 @@ static acpi_status pnpacpi_allocated_resource(struct acpi_resource *res,
* _CRS, but some firmware violates this, so parse them all.
*/
irq = &res->data.irq;
- for (i = 0; i < irq->interrupt_count; i++) {
- pnpacpi_parse_allocated_irqresource(dev,
- irq->interrupts[i],
- irq->triggering,
- irq->polarity,
- irq->sharable);
+ if (irq->interrupt_count == 0)
+ pnp_add_irq_resource(dev, 0, IORESOURCE_DISABLED);
+ else {
+ for (i = 0; i < irq->interrupt_count; i++) {
+ pnpacpi_parse_allocated_irqresource(dev,
+ irq->interrupts[i],
+ irq->triggering,
+ irq->polarity,
+ irq->sharable);
+ }
+
+ /*
+ * The IRQ encoder puts a single interrupt in each
+ * descriptor, so if a _CRS descriptor has more than
+ * one interrupt, we won't be able to re-encode it.
+ */
+ if (pnp_can_write(dev) && irq->interrupt_count > 1) {
+ dev_warn(&dev->dev, "multiple interrupts in "
+ "_CRS descriptor; configuration can't "
+ "be changed\n");
+ dev->capabilities &= ~PNP_WRITE;
+ }
}
break;
case ACPI_RESOURCE_TYPE_DMA:
dma = &res->data.dma;
- if (dma->channel_count > 0) {
+ if (dma->channel_count > 0 && dma->channels[0] != (u8) -1)
flags = dma_flags(dma->type, dma->bus_master,
dma->transfer);
- if (dma->channels[0] == (u8) -1)
- flags |= IORESOURCE_DISABLED;
- pnp_add_dma_resource(dev, dma->channels[0], flags);
- }
+ else
+ flags = IORESOURCE_DISABLED;
+ pnp_add_dma_resource(dev, dma->channels[0], flags);
break;
case ACPI_RESOURCE_TYPE_IO:
@@ -331,12 +348,29 @@ static acpi_status pnpacpi_allocated_resource(struct acpi_resource *res,
if (extended_irq->producer_consumer == ACPI_PRODUCER)
return AE_OK;
- for (i = 0; i < extended_irq->interrupt_count; i++) {
- pnpacpi_parse_allocated_irqresource(dev,
- extended_irq->interrupts[i],
- extended_irq->triggering,
- extended_irq->polarity,
- extended_irq->sharable);
+ if (extended_irq->interrupt_count == 0)
+ pnp_add_irq_resource(dev, 0, IORESOURCE_DISABLED);
+ else {
+ for (i = 0; i < extended_irq->interrupt_count; i++) {
+ pnpacpi_parse_allocated_irqresource(dev,
+ extended_irq->interrupts[i],
+ extended_irq->triggering,
+ extended_irq->polarity,
+ extended_irq->sharable);
+ }
+
+ /*
+ * The IRQ encoder puts a single interrupt in each
+ * descriptor, so if a _CRS descriptor has more than
+ * one interrupt, we won't be able to re-encode it.
+ */
+ if (pnp_can_write(dev) &&
+ extended_irq->interrupt_count > 1) {
+ dev_warn(&dev->dev, "multiple interrupts in "
+ "_CRS descriptor; configuration can't "
+ "be changed\n");
+ dev->capabilities &= ~PNP_WRITE;
+ }
}
break;